Bug Summary

File:.build-ci/../libnvme/test/utils.c
Warning:line 64, column 17
Value of 'errno' was not checked and may be overwritten by function 'fileno'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name utils.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/__w/nvme-cli/nvme-cli/.build-ci -fcoverage-compilation-dir=/__w/nvme-cli/nvme-cli/.build-ci -resource-dir /usr/lib/llvm-19/lib/clang/19 -include /__w/nvme-cli/nvme-cli/.build-ci/nvme-config.h -I libnvme/test/test-mi.p -I libnvme/test -I ../libnvme/test -I . -I .. -I ccan -I ../ccan -I libnvme/src -I ../libnvme/src -D _FILE_OFFSET_BITS=64 -D _GNU_SOURCE -U NDEBUG -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -std=gnu99 -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-opt-analyze-headers -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /__w/nvme-cli/nvme-cli/.build-ci/scan-results/2026-06-24-175442-590-1 -x c ../libnvme/test/utils.c
1// SPDX-License-Identifier: LGPL-2.1-or-later
2/*
3 * This file is part of libnvme.
4 *
5 * Common test utilities.
6 *
7 * Copyright (c) 2022 Code Construct
8 */
9
10#include <err.h>
11#include <stdlib.h>
12#include <unistd.h>
13
14#include "utils.h"
15
16FILE *test_setup_log(void)
17{
18 FILE *fd;
19
20 fd = tmpfile();
21 if (!fd)
22 err(EXIT_FAILURE1, "can't create temporary file for log buf");
23
24 return fd;
25}
26
27void test_close_log(FILE *fd)
28{
29 fclose(fd);
30}
31
32void test_print_log_buf(FILE *logfd)
33{
34 char buf[4096];
35 int rc;
36
37 if (!ftell(logfd))
1
Taking false branch
→
38 return;
39
40 rewind(logfd);
41
42 printf("--- begin test output\n");
43
44 while (!feof(logfd) && !ferror(logfd)) {
2
←
Assuming the condition is false
→
45 size_t rlen, wlen, wpos;
46
47 rlen = fread(buf, 1, sizeof(buf), logfd);
48 if (rlen <= 0)
49 break;
50
51 for (wpos = 0; wpos < rlen;) {
52 wlen = fwrite(buf + wpos, 1, rlen - wpos, stdoutstdout);
53 if (wlen == 0)
54 break;
55 wpos += wlen;
56 }
57
58 if (feof(logfd) || ferror((logfd)))
59 break;
60 }
61
62 printf("--- end test output\n");
63 rewind(logfd);
3
←
After calling 'rewind' reading 'errno' is required to find out if the call has failed
→
64 rc = ftruncate(fileno(logfd), 0);
4
←
Value of 'errno' was not checked and may be overwritten by function 'fileno'
65 if (rc)
66 printf("failed to truncate log buf; further output may be invalid\n");
67}
68